Not too sure what to build on him. I barely used him since the skin came out. Tell me... what do I build for jungle?

Udyr is burst damage and you cycle his attacks really fast. Q puts a DoT on that adds additional magic damage based on his total AD that falls off every 2 seconds. If you charge someone with bear stance, stun then hit q on them, hit W then E (keep hitting til stun (~6 seconds) then Q again you can ruin someone's day.

Udyr is straight AD. You can build AP for his ult/turtle mode but it's not really worth it.

The build I used to use was start with cloth armor 5 health pots, get Q first, Start at wolves, move to golems and get a point in Turtle, move to banshees and then wolves again. Repeat til you have enough gold for madreds razor. After that go get blue buff, and put a point in bear mode. you should gank ~5 or 6 if someone wants a gank. Don't go before you have rank 3 tiger or rank 2 bear. build razor into wriggle's lantern so you can have a ward every 3 mins. Build up AD after that and focus the carry in team fights, or whoever you can stun in a gank. Your Q can even melt tanks too, if they don't defend themselves well enough. Get merc treads if the enemy team has lots of disables/stuns/slows otherwise get attack speed boots. Q always takes priority when you level, W is last priority. You can level E and R in whatever order you wish. Udyr's ult isn't all that great when he is AD.

End Game Item Build

Attack speed boots/merc treads

Wriggle's Lantern

Infinity Edge

Black Cleaver

Ghost Blade

Blade of the Ruined King or Bloodthirster

Summoner spells

Smite

Flash

use whatever masteries you want. I'd copy my page but that's a secret.